Pyro - Spotify music voting for parties
Twinjack - Stream Spotify music with anyone with just a link
klaep - music collaboration - klaep is a social music collaboration network for musicians
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
MisterJack - Make and share playlists
ReverbNation Discover - Stream hand-picked, ad free music from emerging artists.